A micromechanical crystal plasticity self-consistent model (SCM) is used to analyse loading histories in 316H stainless steel. SCM predictions on changes in cyclic and creep properties are compared to analyses via the R5 assessment procedure. Plant-relevant cyclic-creep histories at 550 °C are examined with focus on the estimation of accumulated creep strain. The effect of cyclic plasticity on creep is quantified. The levels of creep strain accumulated during different dwells, following loading from different macroscopic stress states, is also evaluated and explained through experimental observations. Assessing the impact of displacement- and load-controlled dwells on the hysteresis loop evolution revealed how different assumptions for creep strain accumulation could employ SCM results to reduce uncertainty. Guidance is provided in the development of extrapolation frameworks for structural parameters based on the SCM results which could be used directly in structural assessment to estimate the inelastic strain accumulation with a lower degree of conservatism.

微机械晶体塑性自洽模型 (SCM) 用于分析 316H 不锈钢的加载历史。将 SCM 对循环和蠕变特性变化的预测与通过 R5 评估程序进行的分析进行比较。检查了 550 °C 下与植物相关的循环蠕变历史，重点是对累积蠕变应变的估计。循环塑性对蠕变的影响被量化。在不同宏观应力状态加载后，在不同停留期间累积的蠕变应变水平也通过实验观察进行评估和解释。评估位移和负载控制的驻留对滞后回线演化的影响揭示了蠕变应变累积的不同假设如何利用 SCM 结果来减少不确定性。